Submission #1030483

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030483		LmaoLmao	Knapsack (NOI18_knapsack)	C++14	0 / 100	3 ms	604 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;

using ll = long long;
using ii = pair<int, int>;
using aa = array<int,3>;

const int N = 1e6+5;
const int INF = 1e9;

struct goods
{
    double avg;
    ll v;
    int w;
    ll k;
};
bool cmp(goods a,goods b) {
    return (a.avg<b.avg);
}

ll dp[2005];
goods a[100005];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    #endif
    int n,s;
    cin >> s >> n;
    for(int i=1;i<=s;i++) {
        dp[i]=0;
    }
    dp[0]=0;
    for(int i=1;i<=n;i++) {
        cin >> a[i].v >> a[i].w >> a[i].k;
        a[i].avg=((a[i].v*1.0)/(a[i].w*1.0));
    }
    sort(a+1,a+1+n,cmp);
    ll ans=0;
    for(int i=1;i<=n;i++) {
        for(ll j=s;j>0;j--) {
            int m=min(j/a[i].w,a[i].k);
            if(j>=a[i].w) dp[j]=max(dp[j],dp[j-(m*a[i].w)]+m*a[i].v);
            ans=max(ans,dp[j]);
            //cout << dp[j] << ' ';
        }
        //cout << endl;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:31:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     freopen("out.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27